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About an hour ago, I was just doing normal stuff on my MBP (safari, pages, ical, iPhoto) and then when I switch over to pages, the pages document blanks and then starts flashing random colors, from blue to red to green, to the whole spectrum. I took a screen shot of the problem a couple of times, and I attached on of them.. After the 4th screen shot it the cursor freezes and the pages is still throwing colors at me.
So I do a hard restart, and log back in open up Safari again, to post this, and it took me 3 tries, because it kept on crashing. And well it looks like this time I got lucky.

This happened once before but on a restart, the screen started showing random colors, took out the battery and restarted it and back to normal, didn't really think twice about it, I was in a hurry to get it back up. That was about 2 months ago.

Looks like a video card problem, but could be other things, like motherboard or software corruption. Is your MBP still covered by warranty or Apple Care? If it is, I'd call Apple and have a discussion with them about this.

You could try using Onyx or MainManu to run maintenance scripts and re-building, etc. to see if that helps. Or even go to Disk Utility and do a disk verify or repair.